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<?php $x = new ArrayObject(NULL, ArrayObject::ARRAY_AS_PROPS, 'RecursiveArrayIterator');
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: ArrayObject::__construct(): Argument #1 ($array) must be of type array, null given in /in/iXfql:2 Stack trace: #0 /in/iXfql(2): ArrayObject->__construct(NULL, 2, 'RecursiveArrayI...') #1 {main} thrown in /in/iXfql on line 2
Process exited with code 255.
Output for 7.0.20, 7.1.5 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught InvalidArgumentException: Passed variable is not an array or object in /in/iXfql:2 Stack trace: #0 /in/iXfql(2): ArrayObject->__construct(NULL, 2, 'RecursiveArrayI...') #1 {main} thrown in /in/iXfql on line 2
Process exited with code 255.
Output for 7.0.0 - 7.0.14, 7.1.0
Fatal error: Uncaught InvalidArgumentException: Passed variable is not an array or object, using empty array instead in /in/iXfql:2 Stack trace: #0 /in/iXfql(2): ArrayObject->__construct(NULL, 2, 'RecursiveArrayI...') #1 {main} thrown in /in/iXfql on line 2
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28
Fatal error: Uncaught exception 'InvalidArgumentException' with message 'Passed variable is not an array or object, using empty array instead' in /in/iXfql:2 Stack trace: #0 /in/iXfql(2): ArrayObject->__construct(NULL, 2, 'RecursiveArrayI...') #1 {main} thrown in /in/iXfql on line 2
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Fatal error: Undefined class constant 'ARRAY_AS_PROPS' in /in/iXfql on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected ',', expecting '(' in /in/iXfql on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected ',', expecting '(' in /in/iXfql on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'('' in /in/iXfql on line 2
Process exited with code 255.

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